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Tripp 
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Joined: 20 Jun 2011
Location: Florida
Points: 45
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 Topic: 12 volt
Posted: 11 Oct 2011 at 6:51am |
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I'm having problems getting my 12 volt alternator to start charging below 1000 rpms, it won't kick in till 1400. Any ideas?
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Stan IL&TN
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Joined: 13 Sep 2009
Location: Elvis Land
Points: 6730
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Posted: 11 Oct 2011 at 6:55am |
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Install a smaller pully on the alternator.
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1957 WD45 dad's first AC
1968 one-seventy
1956 F40 Ferguson
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Tripp
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Joined: 20 Jun 2011
Location: Florida
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Posted: 11 Oct 2011 at 7:04am |
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Already has the smallest. Anything else.
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
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Posted: 11 Oct 2011 at 7:06am |
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I used an alternator off an old Blazer. Never needs revved up to work. A smaller pulley on the alternator will help, live with it, or replace the alternator. It don't take much to wind her up a bit after the oil pressure gets up good. :)
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Rfdeere
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Joined: 11 Sep 2009
Location: Idaville, IN
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Posted: 11 Oct 2011 at 7:34am |
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Is it a one wire alternator ?
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Jeff Z. NY
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Joined: 11 Sep 2009
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Posted: 11 Oct 2011 at 7:59am |
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Tripp, What is the diameter of the pulley you have.
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I Love Meatballs and Dumplings on Toast with Gravy and Rosemary and ??? {Open For Suggestions}
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 11 Oct 2011 at 10:29am |
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Most one wire can be wired with an additional wire to the ignition circuit through a lamp, diode, resistor to start charging at low rpms. Otherwise having to goose the engine to get charging started is normal for 1 wire alternator. A cost of simplicity. You need the lamp, diode, or resistor to keep the alternator from back feeding the ignition and preventing you stopping the gas engine. On a diesel and you can do it on a gas, a switch that closes on oil pressure rise can connect the excitation wire to the alternator. I know NAPA has a suitable switch, but its been a while since I looked it up and I don't remember their part number. I have one here somewhere for some planned project.
Gerald J.
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Tripp
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Posted: 11 Oct 2011 at 10:43am |
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It's a 3 wire. Pulley is about 2.5 to 3 inches.
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Jeff Z. NY
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Posted: 11 Oct 2011 at 10:47am |
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If it is three inches you can get a 2 1/2 inch pulley.
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I Love Meatballs and Dumplings on Toast with Gravy and Rosemary and ??? {Open For Suggestions}
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CTuckerNWIL
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Location: NW Illinois
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Posted: 11 Oct 2011 at 11:03am |
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Jeff, I made my own on the 45. I didn't want the alternator hanging out the front of the genny bracket, so I made a longer hub and cut the pulley to the same size as the old genny pulley.
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wfmurray
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Joined: 13 Sep 2009
Location: Bostic NC
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Posted: 11 Oct 2011 at 11:06am |
I run a wire from the term to excite it to switch on dash . Crank it up turn on switch and turn switch back off, will charge untill you cut motor off. Should have used push button . Leave it on and it will drain battery when stored .Using switch saves reving a cold engine.
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Gerald J.
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Location: Hamilton Co, IA
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Posted: 11 Oct 2011 at 12:47pm |
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Diode, resistor, or lamp to the ignition circuit does the same function as the switch and does it automatically.
Gerald J.
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DonBC
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Posted: 11 Oct 2011 at 12:51pm |
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If it already is a 3 wire setup possibly the diode is burnt out.
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Steve in NJ
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Posted: 11 Oct 2011 at 2:04pm |
If you have a three wire Alternator on it, you shouldn't have any problems charging. If its not charging as soon as you start the engine, there's an internal problem with the Alternator, unless its not wired correctly. Most one wire Alternators do not charge till the rpm's reach 1200-1400. A Diode or lamp can be used down stream to eliminate the Igniton back feed as mentioned. Also use an Ignition switch to control power on board the Tractor to eliminate any parasitic draws. With the Igntion switch controlling power, once the switch is shut off, everything should be off. HTH
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